<template>
  <div class="bottom-bar">
   <div class="check-content">
      <check-button 
            :is-checked="isSelectAll" 
            class="check-button"
            @click.native="checkClick"/>
      <span>全选</span>
   </div>

   <div class="price">
     合计： {{totalPrice}}
   </div>

   <div class="calculate">
     去计算（{{checkLength}}）
   </div>
  </div>
</template>

<script>
import CheckButton from 'components/content/checkButton/CheckButton'

import { mapGetters } from 'vuex'

export default {
  name: "CartBottomBar",
  components: {
    CheckButton
  },
  computed: {
    ...mapGetters(['cartList']),
    totalPrice() {
      return this.cartList.filter(item => {
        return item.checked
      }).reduce((preValue, item) => {
        return preValue + item.price * item.count
      },0).toFixed(2)
    },
    checkLength() {
      return this.cartList.filter(item => item.checked).length
    },
    isSelectAll() {
      // return !(this.cartList.filter(item => item.checked).length)
      if(this.cartList.length === 0) return false
      // return !this.cartList.find(item => !item.checked)

      // 普通遍历的方法
      for(let item of this.cartList) {
       if(!item.checked) {
         return false
       }
      }

      return true
    }  
  },
  methods: {
    checkClick() {
      if(this.isSelectAll) { //全部选中
        this.cartList.forEach(item => item.checked = false)
      } else { //有部分或者全部不选中
        this.cartList.forEach(item => item.checked = true)
      }
    },
    calcClick() {
      if(!this.isSelectAll) {
        this.$toast.show('请选择购买的商品', 2000)
      }
    }
  }
}
</script>

<style>
.bottom-bar {
  display: flex;
  height: 40px;
  background-color: #eee;
  position: relative;
  line-height: 40px;
  font-size: 14px;
}

.check-content {
  display: flex;
  align-items: center;
  margin-left: 10px;
  width: 60px;
}

.check-button {
  width: 20px;
  height: 20px;
  line-height: 20px;
  margin-right: 5px;
}

.price {
  margin-right: 20px;
  flex: 1;
}

.calculate {
  width: 90px;
  background: var(--color-tint);
  color: #fff;
  text-align: center;
}
</style>